IPitomy IP400 User Guide - Manual (Page 17)

Setup
9
Signaling
Signaling Port The UDP port that the VoIP Gateway uses for incoming call setup
request.
RTP
RTP Port Enter the Base UDP port which the VoIP Gateway uses for RTP
and RTCP. The VoIP Gateway uses a block of UDP ports for
sending/receiving RTP and RTCP packets from this port number.
IP Tos/DiffServ
Call Signaling Pack-
ets TOS field in IP header for outgoing SIP packets.
RTP Packets TOS field in IP header for outgoing RTP/RTCP packets
Session
Enable Session Timer Check this box if you want the VoIP Gateway to encode the
Timer header in all INVITE requests for ringing timeout.
Desired Refresh Time Enter the desired refresh time in seconds.
Minimum Refresh
Time Enter the minimum value of the session timer
NAT Traversal
NONE Check this box if no NAT Traversal is required.
UPNP Check this box if you want to use the UPnP option for NAT
traversal.
Enable STUN Server Enable this if STUN is the preferred NAT traversal method.
Address Specify the IP address of the STUN server
Port Enter the port number of STUN server.